I bought a Pentacon Six NEW in 1971 for 112-95 --- then I got a P6 bellows for 15 and had some adaptors made by a family company off Tottenham Court Road London so I could use a Kodak Aero-Ektar 178mm f 2.5 ex-RAF lens I was given and a 12" Dallmeyer I was given and got very good results until the shutter went ! Luckily,there was a man who was employed by the Pentacon importers for GB who knew all the 'tricks' for the P6 and put a new shutter in and greased everything properly and I have had no troubles since. I agree the viewfinder is very dark and flash sych at 1/20th is far too slow but I enjoy getting out my P6 gear and using it every so often.